I didn't get very far into this book the style is not my favorite kind, but I would have kept reading if it was just that.
He was talking about manipulative speech and the author stated that when Joseph asked the cupbearer to remember him to Pharaoh, that he was trying to manipulate God and that this also showed that Joseph harbored unforgiveness about what happened. I see nothing in those verses, or story, to make me think Joseph had done wrong to tell the cupbearer or anything from that passage that speaks at unforgiveness. Such speculations instantly make me dislike a book. Yes, it is a pet peeve of mine, I know.